Joseph c



J. c. HENDERSON. Hot Air Furnace.

Patented Dec. '23, 1862.

-EIIEZILI UNITED STATES PATENT OFFICE.

JOSEPH O. HENDERSON, OF ALBANY, NEW YORK.

IMPROVEMENT in?! H EATERS.

Specification forming part of Letters Patent No. 37,228, dated December23, 1862.

To all whom it may concern.-

Be it known that I, J OSEPH O. HENDER- soN, of Albany, in the county ofAlbany and State of New York, have invented, made, and applied to use acertain new and useful Improvement in Heaters; and I do hereby declarethe following to be a full, clear, and exact description of the same,reference being bad to the annexed drawings, making part of this S)CGifi( '1tl0l1, wherein Figure 1 is a vertical section through thesupply-door, and Fig. 2 is a similar vertical section of my heater'atright angles to Fig. 1.

Similar marks of reference denote the same p ms.

The nature of my said invention consists of a conical chamber over thefire and within an inclosiug-cylinder, which cone retains the gaseousproducts sufficiently long to insure a perfect combustion before suchproducts pass away from an annular opening at the base of said cone, incombination with a vertical range of hot-air pipes around the base ofsaid cone and within the inclosing-cylinder, so that the products ofcombustion passing away from the base of aforesaid conical chamber comedirectly in contact with said inclosing-case and said range of verticalpipes, thereby increasing the efficiency of said case and pipes inimparting heat to the surrounding air, because said parts are morethoroughly heated than they would be if the heat simply circulated in acylindrical drum of pipes without said conical chamber. Above thisconical chamber I introduce a cylinder open at the top and provided withair-pipes at the bottom, so that a current of air circulates throughthis cylinder, carrying 0E heat from the conical combustion-chamber andfrom its cylinder. I am therefore enabled not only to obtain a perfectcombustion of the fuel, but also to direct the heat to theradiating-surfaces and obtain a large extent of such radiating-surfacein a small space.

In the drawings, a is the ash-pit. 1) represents the fire-grate; c, thefirebox. d is a cylinder rising above the annular plate 0, that projectsfrom the fire-box 0. f is the pipe for the escape of the products ofcombustion to a chimney, and c is the door at which the fuel issupplied. g is a plate on the top of the cylinder (1, similar to theplate 6, and both these plates 0 and g are perforated with correspondingholes that receive the ends of the vertical pipes h h, that become arange of vertical circulating hot-air pipes, giving off heat to thesurrounding air. 70 is a cone over the fire, forming a conicalcombustion-chamber that retains the products of combustion from the firein the box 0 sufficiently to perfect said combustion, the gases, &c.,passing away from the lower edge between that and the cylinder d, and incontact with the said pipes It, to heat the same thoroughly, asaforesaid. The chute l, passing from the door 0, through one side of thecone If, supplies the fuel to the fire. The conical combustion-chamber7c is at the base of and rises within the cylinder t, which cylinder issustained at its upper end by the anular plate {1 and m m are pipes fromthis cylinder 2', opening through the plate 6, so that a current of airwill circulate through these pipes on m and cylinder 2', as indicated bythe arrows, and, coming in contact with the conical combustion-chamberIt, will abstract heat therefrom and prevent the same becoming too hot,and said heat, as well as that of the cylinder t, pipes h h, andcylinder or case (1-, will be diffused in the surrounding atmosphere. Iam thus enabled to obtain a large extent of heating-surface, and alsoefl'ect a perfect combustion of the fuel.

What I claim, and desire to secure by Letters Patent, is-

1. The range of vertical hotair pipes h h within the cylinder d, incombination with the cone k, that deflects the products of combustionagainst the base of said pipes and cylinder for the purposes and asspecified.

2. The conical chamber Ir, in combination with the cylinder t andair-pipes on m, as and for the purposes specified.

In witness whereof I have hereunto set my signature this 29th day ofSeptember, 1862.

J. G. HENDERSON.

Witnesses:

A. V. DE WITT, JOHN VAN DYCH.

